Criterion is the singular of Criteria
Phenomenon is the singular of – Phenomena
Datum is the singular of – Data
Medium is the singular of – Media
Memorandum is the singular of – Memos
Curriculum is the singular of – Curricula
Gymnasium is the singular of – Gymnasia
Spectrum is the singular of – Spectra
Stadium -is the singular of Stadia
Referendum is the singular of – Referenda
Microorganism is the singular of – Microorganisms
Proviso is the singular of – Provisos
Alumna is the singular of – Alumnae
Antenna is the singular of – Antennae
Analysis is the singular of – Analyses
Hypothesis is the singular of – Hypotheses
Parenthesis is the singular of – Parentheses
Diagnosis is the singular of – Diagnoses
Thesis is the singular of – Theses
Vertebra is the singular of – Vertebrae
Formula is the singular of – Formulas
Larva is the singular of – Larvae
Erratum is the singular of – Errata
Ultimatum is the singular of – Ultimatums
Aquarium is the singular of – Aquaria
Tariff is the singular of – Tariffs
Forum is the singular of – Forums
Maximum is the singular of – Maxima
Medium is the singular of – Media
Premium is the singular of – Premiums
Novum is the singular of – Novi
Minimum is the singular of – Minima
Premium is the singular of – Premiums
Ultimatum is the singular of – Ultimatums
Perpetuum is the singular of – Perpetua
Memorandum is the singular of – Memos
Infinium is the singular of – Infinia
Graffito is the singular of – Graffiti
Carnivore is the singular of – Carnivores
Proviso is the singular of – Provisos
Hippopotamus is the singular of – Hippopotami
Aquarium is the singular of – Aquaria
Oasis is the singular of – Oases
Radius is the singular of – Radii
Memorandum is the singular of – Memos
Alumna is the singular of – Alumnae
Stimulus is the singular of – Stimuli
Phenomenon is the singular of – Phenomena
Maximum is the singular of – Maxima